論文

査読有り
2002年

XPS, XANES and EXAFS investigations of CuO/ZnO/Al(2)O3/ZrO2 mixed oxide catalysts

PHYSICAL CHEMISTRY CHEMICAL PHYSICS
  • S Velu
  • ,
  • K Suzuki
  • ,
  • CS Gopinath
  • ,
  • H Yoshida
  • ,
  • T Hattori

4
10
開始ページ
1990
終了ページ
1999
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1039/b109766k
出版者・発行元
ROYAL SOC CHEMISTRY

Systematic X-ray photoelectron spectroscopy (XPS), X-ray induced Auger electron spectroscopy (AES), X-ray absorption near edge structure (XANES) and extended X-ray absorption ne structure (EXAFS) studies were undertaken to investigate the electronic structure, chemical states and local geometry of the active species in the CuO/ZnO/Al2O3/ZrO2 multicomponent mixed oxide catalysts employed in the oxidative steam reforming of methanol (OSRM) reaction for H-2 production. The core level XPS and AES indicated the existence of CuO and ZnO-like species. Two kinds of zirconium species, one similar to that of ZrO2 and another with relatively higher electron density were noticed from the Zr 3d core level XPS of Zr- containing catalysts. The valence band (VB) XPS studies revealed that for Zr- containing catalysts, the Cu 3d anti-bonding orbital splits from the main VB and shifts toward lower binding energy (BE). The surface Cu/(Al+Zr) ratios were found to be close to those in the bulk while segregation of Zn at the surface was evidenced in all samples. The XANES and EXAFS results also indicated the existence of CuO and ZnO-like species, whose local environments are modified with respect to the chemical composition. The EXAFS study of the Zr- containing catalysts indicated the existence of a "Cu-O-Zr" bonding with a Cu-Zr distance in the range 3.5 to 3.9 Angstrom. The results indicated the existence of a Cu-Zr synergistic interaction in these catalysts which improved the catalytic performance in the OSRM reaction.

リンク情報
DOI
https://doi.org/10.1039/b109766k
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000175326100047&DestApp=WOS_CPL
URL
http://orcid.org/0000-0002-2540-0225
ID情報
  • DOI : 10.1039/b109766k
  • ISSN : 1463-9076
  • eISSN : 1463-9084
  • ORCIDのPut Code : 9876437
  • Web of Science ID : WOS:000175326100047

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